Jormungant wrote:I found an approach that may work for 16.1787 (aka xs16_069m4koz311); however, I don't know if there is a 3 or 4 glider construction for a transient group that has 7 cells at some point (found on the upper right).

So just 16.836 to go, is that correct? It can be done by making a 1G optimisation to the existing 16G synthesis. There is a B and a loaf that is made in 5G. Instead it can be made in 4G by colliding a block with a 2G loaf+blinker. Frustratingly my phone line is down so I can't post the exact details or make a push to my github repo...

Something I thought of recently: sometime prior to tackling the Still Lifes With A Prime Number of Bits That Must Not Be Named, wouldn’t it make sense to put together a helper utility script for finding likely 3G/4G/5G spark-making reactions?

That script of chris_c's for finding sparkish stuff by population has been very handy, but on multiple runs it ends up painfully re-generating the same population sequences. Why not just write out text files recording the population sequences for each pattern in each gencols output file, and then do a simple text search for the particular sequence that’s wanted?

Seems as if that wouldn’t take much more storage space than the original gencols output, and searches would be thousands of times faster. One byte per population value would be good enough -- no need to record population counts for the big messes that end up over 200 cells or so...?

Maybe it’s worth checking in to Github collision files that are as non-redundant as possible, and also as complete as possible, so that nothing else along the lines of the three-glider switch engine gets missed.

I don’t think it will be that hard to avoid redundancy altogether, with some careful work. Ultimately I’d like to combine this idea with the Enumerating Three-Glider Collisions project, so that for 3G collisions there are maybe 72 collision files checked in -- one for each of the 71 glider collisions with a third glider hitting the reaction at T>=1, and one for all the simultaneous 3G collisions.

As was said in another post somewhere, the current focus is getting a more functional, lower-maintenance system in place for depositing, archiving, and locating syntheses.Once that's done, 17-bit syntheses will be easy to work with.Using the infrastructure currently in place, though, it's a pretty tall order.

chris_c wrote:A preliminary step in this project was creating a translation between Niemiec's still life numbering and apgcodes. The fact that a similar list does not exist for oscillators is the only reason that I didn't reply to Goldtiger's query here.

After seeing Apple Bottom's great work in the wiki, with most small patterns having an auto-generated synthesis, but oscillators showing an invalid pattern message, I was reminded of the above quote. Couldn't a simple numbering system for oscillators be created by using apgcodes and ordering them alphabetically?

Yes, last one down! I'm back online and pushed what will the last commit for a while. All 16-bit still lifes are synthesisable in at most 15G with an average of at most 10.47G!

Thanks to everyone!

Chris led the list with full list of synthesis of 16-bit still lifes. Based on the results of this thread with the latest achievements of the glider I synthesis (semi-automatic way) made its database for synthesis of 16-bit still lifes:

BobShemyakin wrote:But it turned out to be incomplete. List of 108 still lifes, what I not found from the list Chris...I ask to help me fill my database.

I think that recipes for these are all available on chris_c's GitHub repository. Here's a package that should display a synthesis for any still life up to 16 bits (where chris_c's online version only goes up to 12 bits):

The included file bobshemyakinmissinglist.html should have working links to display your 108 missing syntheses. To use it for some other apgcode, open the glidersynth.html page and then append a "?" followed by the apgcode you want.

I checked the first dozen still lifes in your list, and they were all there, and it looked like the glider counts were right. It looks like most of them are conversions from other objects, sometimes in several stages.